使用MVVM与ObservableCollection的WPF DataGrid绑定

如何解决使用MVVM与ObservableCollection的WPF DataGrid绑定

我的MVVM / WPF代码有问题，无论我读了多少篇文章/问题，我都无法解决。

基本上，我正在使用Dapper查询数据库并进行以下设置：

1. 客户类是一个实体类，它反映了我的数据库表（目前仅用于测试的名称属性）
2. CustomerDataAccess类，该类具有“ GetCustomers”方法，并将其放入ObservableCollection
3. AppSession这是我的ViewModel
4. 我的XAML

所以我想发生的是，当我单击“单击”按钮时，它将运行xaml.cs以运行AppSessions-CDA.getCustomers（）分配给集合，然后将集合绑定到XAML。

不使用按钮，我的数据就没问题，但是当我尝试实现按钮时，它永远不会映射，有人可以帮忙吗？

客户数据访问

public class CustomerDataAccess : BaseNotificationClass
    {
        public ObservableCollection<Customer> Customers { get; set; }
        public ObservableCollection<Customer> GetCustomers()
        {
            string sql = "SELECT TOP 1 * FROM CUSTOMERS";
            Customers = new ObservableCollection<Customer>();

            using (IDbConnection connection = new System.Data.SqlClient.SqlConnection(ConnectionHelper.ConnectionStringRetrieve("CSharpTesting")))
            {
                var output = connection.Query<Customer>(sql).ToList();
                Customers = new ObservableCollection<Customer>(output);
                return Customers;
            }
        }
    }

AppSession类

public class AppSession : BaseNotificationClass
    {
        public CustomerDataAccess cda { get; set; }
        public ObservableCollection<Customer> customerList { get; set; }
        public AppSession()
        {
            cda = new CustomerDataAccess();
            //This brings me the right data back
            //cda.Customers = new ObservableCollection<Customer>();
            //cda.Customers = cda.GetCustomers();
        }

        public void ListCustomers()
        {
            cda.Customers = new ObservableCollection<Customer>();
            cda.Customers = cda.GetCustomers();
        }
    }

MainWindow.xaml.cs

public partial class MainWindow : Window
    {
        private AppSession _appSession;
        public MainWindow()
        {
            InitializeComponent();
            _appSession = new AppSession();

            DataContext = _appSession;
        }

        private void OnClick_GetCustomers(object sender,RoutedEventArgs e)
        {
            _appSession.ListCustomers();
            //This was just me testing it was clicking
            searchButton.Content = "Clicked";
        }
    }

DataGrid绑定

<DataGrid Grid.Column="1" Grid.Row="0"
                  Height="Auto"
                  Width="Auto"
                  AutoGenerateColumns="False"
                  AlternationCount="3"
                  AlternatingRowBackground="AliceBlue"
                  ItemsSource="{Binding cda.Customers}">

            <DataGrid.Columns>
                <DataGridTextColumn Header="Name" Width="*" Binding="{Binding Name}"/>
                <DataGridTextColumn Header="Office Phone" Width="*"/>
                <DataGridTextColumn Header="Email Address" Width="*"/>
                <DataGridTextColumn Header="Post Code" Width="*"/>
            </DataGrid.Columns>
        </DataGrid>